mineral

Sodalite

Na8(Al6Si6O24)Cl2

Hardness: 5.5-6 (Mohs scale), Color: Royal blue to violet-blue with white/gray veining, Luster: Vitreous to greasy, Crystal structure: Cubic (Isometric), Cleavage: Poor, Specific Gravity: 2.27-2.33

Hardness: 5

Identified June 11, 2026More mineral →

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Physical properties

Hardness: 5.5-6 (Mohs scale), Color: Royal blue to violet-blue with white/gray veining, Luster: Vitreous to greasy, Crystal structure: Cubic (Isometric), Cleavage: Poor, Specific Gravity: 2.27-2.33

Formation & geological history

Forms primarily in sodium-rich igneous rocks such as nepheline syenites and phonolites, typically in plutonic environments. It is a member of the feldspathoid group.

Uses & applications

Used primarily as a gemstone in jewelry (cabochons and beads), decorative carvings, household ornaments, and occasionally as an architectural facing stone.

Geological facts

Sodalite is often mistaken for Lapis Lazuli, but unlike Lapis, Sodalite rarely contains golden pyrite specks. Many specimens exhibit strong orange fluorescence under long-wave ultraviolet light.

Field identification & locations

Commonly found in Canada (British Columbia and Ontario), Brazil, Namibia, and Russia. Identify in the field by its intense blue color, white calcite streaks, and lack of pyrite compared to lapis lazuli.